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Abstract

Modern computer hardware can support multiple power levels. Transitioning between these levels needs to be handled in an orderly fashion. For instance, a hardware bus needs to be powered up before the devices connected to it. The main power supply must be up before any buses can be powered. This disclosure proposes a simple, yet effective method for implementing power transition order.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
54% of the total text.

Method for Orderly Computer Device Power Transitioning

Modern computer
hardware can support multiple power
levels. Transitioning between these
levels needs to be handled in an
orderly fashion. For instance, a
hardware bus needs to be powered up
before the devices connected to it. The
main power supply must be up
before any buses can be powered. This
disclosure proposes a simple,
yet effective method for implementing power transition order.

While there are
many existing methods of implementing
device power transition order, most are cumbersome to implement.
Perhaps the most accurate method may be to create a device power tree
such as proposed by the ACPI specification.
This technique shows
every power dependency between all devices within a computer.
However, ACPI requires system BIOS support to recognize the device
power hierarchy and is therefore machine dependent and difficult to
implement across platforms. The
dependency tree is also often
difficult to calculate and can change as devices are added or removed
from a computer. Nor does it take into
account software-only virtual
devices or applications wishing to participate in power management.
For light-weight Network Client type machines a simpler solution is
required.

This disclosure
demonstrates a simple method of
implementing orderly power transitions.
Proposed are device
classifications which classify a device by its typical position
within a power hierarchy and determine the order of po...